- 1彈簧刀、跳刀（按鈕一按，刀刃從刀柄彈出）。英式英語叫 flick knife。台灣一般也稱彈簧刀，多數地方持有違法。
A pocket knife whose blade is hidden inside the handle and jumps out when you press a button. The point is speed: one hand, one press, and the knife is open. That is also why it people — you cannot see it coming.
This is the American word. In Britain the same knife is usually called a flick knife. In many places, including the UK and much of the US, carrying one is against the law, and that legal shadow sits inside the word: "switchblade" almost never appears in a peaceful sentence. It belongs to films, crime news, and gangs in old musicals. If someone says "he had a switchblade", everyone in the room understands it as a threat, not as a useful tool.
So it is a normal, clear, everyday word — but it names something you would rarely have a friendly reason to mention.
組成switch (a button you press) + blade (the cutting part of a knife). The blade comes out at the flick of a switch.
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
switchbladenoun/ˈswɪt͡ʃˌbleɪd/
- 1
A folding knife with a blade which opens automatically (under spring pressure) when a button is pressed.
switchbladeverb/ˈswɪt͡ʃˌbleɪd/
- 1
To attack or cut with a switchblade.
- I got terrible hangovers from the cheap booze; and, one night, I almost got switchbladed when I put my arm around the wrong "lady of the night.
- They are the American dream torn asunder, like clean fresh laundry left drying on the clothesline, switchbladed by bored boys of summer.
- 2
To spring open or up.
- Switchblading open their silvery cell phones, they call their mortgage brokers and say “Buy.”
- Steering and stabilization fins switchblading out, followed by the wings.
- 3
To (cause to) make a sudden move or transition.
- He briefly rocked medical school, switchbladed to accounting and finally joked his first radio script in 1938.
- The play's principal comic manoeuvre is to have concern switchblading into callousness.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。